1 /*
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * RSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <stdio.h>
17 #include "internal/cryptlib.h"
18 #include <openssl/bn.h>
19 #include <openssl/rsa.h>
20 #include <openssl/objects.h>
21 #include <openssl/x509.h>
22
RSA_sign_ASN1_OCTET_STRING(int type,const unsigned char * m,unsigned int m_len,unsigned char * sigret,unsigned int * siglen,RSA * rsa)23 int RSA_sign_ASN1_OCTET_STRING(int type,
24 const unsigned char *m, unsigned int m_len,
25 unsigned char *sigret, unsigned int *siglen,
26 RSA *rsa)
27 {
28 ASN1_OCTET_STRING sig;
29 int i, j, ret = 1;
30 unsigned char *p, *s;
31
32 sig.type = V_ASN1_OCTET_STRING;
33 sig.length = m_len;
34 sig.data = (unsigned char *)m;
35
36 i = i2d_ASN1_OCTET_STRING(&sig, NULL);
37 j = RSA_size(rsa);
38 if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
39 ERR_raise(ERR_LIB_RSA, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
40 return 0;
41 }
42 s = OPENSSL_malloc((unsigned int)j + 1);
43 if (s == NULL) {
44 ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
45 return 0;
46 }
47 p = s;
48 i2d_ASN1_OCTET_STRING(&sig, &p);
49 i = RSA_private_encrypt(i, s, sigret, rsa, RSA_PKCS1_PADDING);
50 if (i <= 0)
51 ret = 0;
52 else
53 *siglen = i;
54
55 OPENSSL_clear_free(s, (unsigned int)j + 1);
56 return ret;
57 }
58
RSA_verify_ASN1_OCTET_STRING(int dtype,const unsigned char * m,unsigned int m_len,unsigned char * sigbuf,unsigned int siglen,RSA * rsa)59 int RSA_verify_ASN1_OCTET_STRING(int dtype,
60 const unsigned char *m,
61 unsigned int m_len, unsigned char *sigbuf,
62 unsigned int siglen, RSA *rsa)
63 {
64 int i, ret = 0;
65 unsigned char *s;
66 const unsigned char *p;
67 ASN1_OCTET_STRING *sig = NULL;
68
69 if (siglen != (unsigned int)RSA_size(rsa)) {
70 ERR_raise(ERR_LIB_RSA, RSA_R_WRONG_SIGNATURE_LENGTH);
71 return 0;
72 }
73
74 s = OPENSSL_malloc((unsigned int)siglen);
75 if (s == NULL) {
76 ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
77 goto err;
78 }
79 i = RSA_public_decrypt((int)siglen, sigbuf, s, rsa, RSA_PKCS1_PADDING);
80
81 if (i <= 0)
82 goto err;
83
84 p = s;
85 sig = d2i_ASN1_OCTET_STRING(NULL, &p, (long)i);
86 if (sig == NULL)
87 goto err;
88
89 if (((unsigned int)sig->length != m_len) ||
90 (memcmp(m, sig->data, m_len) != 0)) {
91 ERR_raise(ERR_LIB_RSA, RSA_R_BAD_SIGNATURE);
92 } else {
93 ret = 1;
94 }
95 err:
96 ASN1_OCTET_STRING_free(sig);
97 OPENSSL_clear_free(s, (unsigned int)siglen);
98 return ret;
99 }
100